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Activity

Shadows and mirrors

Summary: 
Use mirrors to shine light into a shadow, and use sticky notes or draw on the mirror to make (reverse) images in the patch of light.
Science content (2016 curriculum): 
Physics: Light and Sound (1)
Earth/Space: Sun, Moon, Solar System, Universe (1, 4, 6)
Science topic (2005 curriculum connection): 
Earth and Space Science: Stars and Planets (grade 3)
Physical Science: Light and Sound (grade 4)
Lessons activity is in: 
Materials: 
  • a clear sunny day (if outside) or a dim room and flashlights (if inside)
  • small mirrors
  • sticky notes and scissors
  • dry erase markers
  • large sheet of light-coloured paper (if outside) or white boards e.g. foam core on stands or against walls (if inside)
Procedure: 

If this activity is run inside:
Show or challenge students to reflect the beam of a flashlight off a mirror and onto a white board. Younger students will need a fair amount of help or time to get the angles sorted out.

If this activity is run outdoors on a sunny day:
Mirrors can be used bend the sun's rays around an object and bring light into its shadow. Students may be familiar with seeing sunlight reflected off objects forming bright patches. Show students how to use a mirror to make a splash of light in the centre of their own shadow.
Outside, they may find it easier to squat down to make a large shadow, then have the sun shine over their shoulder onto the mirror, which is tilted to reflect onto the ground in front of them. Younger students might need assistance with the placement of the mirror and themselves relative to the sun. A sheet of light paper makes the patterns more clearly seen on a rough or grey ground.

Show all students that by drawing on the mirror, or by making a shape out of a sticky note, they can make patterns and shapes within the patch of reflected light.
Challenge them to write their name or an image, so that it appears right-side-up inside the shadow.

Help all students visualize the path that the light rays take, to reinforce how they are making their patterns, and how shadows are formed.

Discuss some big ideas that students are discovering: Light goes in straight lines and can be reflected. Some surfaces reflect light, some do not.

Notes: 

Try shadow kaleidoscope - see photos.

Grades tested: 
Gr 1
Gr 2
Gr 3
Teacher: 
Ingrid
Mari Matsuo
Teaching site: 
General Gordon Elementary Science Club
Simon Fraser Elementary
Activity originally developed and delivered: 

Outdoors at science club.
Indoors at Simon Fraser Elementary.